Test: Arithmetic Series - Ambitious

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Question 1:   What is the common difference in the following arithmetic series: 2.5,6.4,10.3,... ?
7.8
3.9
2.56
3.2
Question 2:   Which of the following sequences is an arithmetic series?
17.5,15,12.5,10,7.5
1,2,3,5,8,13
0.125,0.250,0.38,0.515,0.655
16,8,4,2,1
Question 3:   What is the 25 th term in the following arithmetic series: 1,4,7,10... ?
74
75
72
73
Question 4:   What is the 31 st term in the following arithmetic series: 45,42.5,40... ?
−31.75
−27.25
−30
110
Question 5:   What is the sum of the first 21 terms in the following arithmetic series: 3,5,7,9 ?
S 21 =368
S 21 =241
S 21 =483
S 21 =512
Question 6:   What is the sum of the first 18 terms in the following series: 21,17,13 ?
S 18 =−256
S 18 =−198
S 18 =−234
S 18 =−212
Question 7:   How many terms in the following arithmetic series 5,9,13,... must be taken if the sum is 702 ?
23
21
18
14
Question 8:   How many terms in the following arithmetic series 0.25,0.75..., must be taken if the sum is 156.25 ?
60
25
30
45
Question 9:   If the 7 th term is 15 and the 20 th term is 41 , find the series
−3,0,3
9,10,11
2,4,6
3,5,7,9
Question 10:   If the 5 th term is 10 and the 11 th term is −14 , find the sum of the first 20 terms
S 20 =−160
S 20 =−200
S 20 =−240
S 20 =−120